Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4dd5035c28521282a8658934fccf3668b9b84120757dfea19131d61d23ee349' 
  AND token = 'Evol47i5GTymnexECtSeuZjcK1f/eHlkRmLZthfBBBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}